Algebra
Basic

Direct Variation

y changes directly in proportion to x.

Formula

y=kxy = kx

Variables

kConstant of proportionality

Example

If y = 3x, then doubling x from 2 to 4 doubles y from 6 to 12.

Did You Know?

Direct variation — double one, double the other — describes everything from Hooke's springs to fair pricing.

variationproportionalgebra